Welcome to the Predator Ecology Lab! 

Since 2008, as part of the Wildlife Science Program in the University of Washington's School of Environmental and Forest Sciences, we have sought a better understanding of how predators influence their surroundings by interacting with one another and their prey. Much of our work also seeks solutions to the challenges of large carnivore conservation and management in a changing world.

The PEL is committed to promoting diversity, equity, inclusion, and a sense of belonging. To that end, we seek new members and partnerships that broaden representation in our field and strive to maintain a balanced, respectful, and supportive work environment.

​Want to support the work being done in the PEL? Please follow this link to make a tax-deductible donation through UW Giving - thanks!
Latest News
October 4, 2022: New paper just out in the journal Bioscience extolling the idea of rewilding the American West by restoring populations of gray wolves and beavers, with longtime colleague Bill Ripple (Oregon State University) at the helm. Thanks, Bill, for including us! Also, we got the cover!
June 17, 2022: Just wrapped up a workshop on the Ecological Importance of Sharks, led by longtime collaborator Mike Heithaus (Florida International University) and hosted by the National Center for Ecological Analysis and Synthesis (NCEAS) at the University of California, Santa Barbara. The scenery and weather were sublime; the company and exchange of ideas even better. Looking forward to working with this group for some time to come, and so many thanks to NCEAS for being such generous and accommodating hosts!
May 27, 2022: Congratulations today go to Michael Havrda, who successfully defended his MS Thesis titled, "Carnivore responses to urbanization and human presence along an urban-wildland gradient in western Washington"! Michael deserves heaps of credit for an excellent presentation and discussion afterwards, and special thanks also to Robert Long, of the Woodland Park Zoo, for being such a great partner on this project!
May 16, 2022: ​Congratulations are in order for PEL alum Dr. Shannon Kachel, whose Dissertation chapter titled, "Predicting carnivore habitat use and livestock depredation risk with false-positive multi-state occupancy models" was just published in the journal Biological Conservation. Excellent work, Shannon!
May 12, 2022: Our new mega-review of sirenian ecological roles and importance is out today in Marine Ecology Progress Series, as an Open Access article! Several years in the making and a passion project in many respects, this effort wouldn't have happened without the support of a great team including Jeremy Kiszka, Aarin-Conrad Allen, and Mike Heithaus (all of Florida International University). Thanks, team, and to Lindsay Marshall (www.stickfigurefish.com.au) for the beautiful artwork! Photo of a Florida manatee courtesy of J. Kiszka.  
February 8, 2022: Today, we are delighted to announce the publication of a special issue of the journal Wildlife Research, for which AW serves as Editor-in-Chief, titled, "The rapidly expanding role of drones as a tool for wildlife research". This special issue features studies pushing the taxonomic and innovation boundaries of drone research and, as a result, helps to address remaining knowledge and application gaps associated with these unpiloted aircraft systems while also showcasing how drone research is likely to continue pushing biology and conservation in exciting new directions. We are grateful to CSIRO Publishing and the journal for supporting this effort, all of the authors who contributed to this special issue, and guest editors Dr. Aaron Johnston (a SEFS alum!) and Dr. Jeremy Kiszka (a partner on our Tetiaroa reef shark project), with whom AW joined to write the Foreword! ​Photo credit: Michael McMahon (launching a fixed-wing drone equipped with a thermal infrared sensor to estimate white-tailed deer, Odocoileus virginianus, population density).
January 26, 2022: It is often tremendous fun to spend time deep down in the reeds exploring the finer details of ecological theory and practice, and that is exactly what led to today's publication, a short communication titled "Optimal barbed wire height for brown bear hair sample collection" in the journal Ursus. The paper, led by Thomas Quinn and also featuring Michael Proctor, chronicles how the standard practice of positioning strands of barbed wire 50 cm above the ground to share hair from passing bears came about (thanks to Michael) while pairing this story with a test of how well this height threshold works (NB: very well!). Stay tuned for more to come from the Alaska Salmon Program's bear project!
January 1, 2022: It gives me great pleasure to announce our new publication in Oikos titled, "Predators reduce niche overlap between sympatric prey"! This paper is the third and final chapter from Dr. Justin Dellinger's dissertation, and Justin deserves many plaudits for pulling this massive effort together. It is also a heartening demonstration of the kind of teamwork for which we strive in the Predator Ecology Lab, with April Craig contributing animal-borne video data revealing mule and white-tailed deer diets in areas with and without wolves, Dr. Shannon Kachel performing the multivariate modeling of the deer diet data, and Dr. Carolyn Shores chipping in with field work, conceptualization, and writing. Many thanks to all of the authors and collaborators who helped to make this paper happen! 
October 29, 2021: We are proud to announce that Lauren Satterfield was selected today as the 2020-2021 recipient of the John Pierce Outstanding Graduate Student Award, given to the student who "best embodies the mission and spirit of the Washington Cooperative Fish and Wildlife Research Unit." Kudos, Lauren!
October 27, 2021: Hearty congratulations to Shannon Kachel, who today successfully defended his PhD dissertation titled, "Large carnivore ecology and conservation in the high mountains of Central Asia"! Many thanks to the members of the audience who turned out in impressive numbers, to Panthera for their support of Shannon's work, and to Dr. Kachel for a job well done! The amazing photo to the right, taken at Shannon's field site in Kyrgyzstan, is by Sebastian Kennerknecht.
October 10, 2021: Two recent publications, both open access, bear mentioning today. First, former UW Quantitative Ecology and Resource Management (QERM) PhD student Dr. Chloe Bracis and I (AW) recently published a paper in Frontiers in Ecology and Evolution exploring the role that resource memory might play in shaping prey responses to introduced predators. Second, the last of a series of papers from the WA Wolf Economy Project, led by Dr. Carol Bogezi, just appeared in the latest issue of Frontiers in Conservation Science. Kudos to Chloe, Carol, and all of the team members on these papers!
September 15, 2021: We are excited to announce the publication of a paper titled, "Loss of predation risk from apex predators can exacerbate marine tropicalization caused by extreme climatic events" in the latest issue of the Journal of Animal Ecology. Part of a special feature titled, "Reconciling Resilience Across Ecological Systems, Species and Subdisciplines" and led by Dr. Rob Nowicki, the paper is based on a simulated grazing experiment showing how risk from Shark Bay's top predator, the tiger shark, is likely buffering recovering temperate seagrasses from being eliminated by foraging dugongs in the wake of a marine heat wave.
August 1, 2021: Thanks to PEL alum Dr. Lily van Eeden for leading another sterling effort under the Wolf Economy Project umbrella, this one titled "Public willingness to pay for gray wolf conservation that could support a rancher-led wolf-livestock coexistence program", which appears in the new August issue of Biological Conservation​!
July 23, 2021: Following on from our earlier post about participating in the Society of Integrative and Comparative Biology's annual meeting special session titled, "S11: Biology's best friend: bridging disciplinary gaps to advance canine science" back in January, the ICB journal issue containing the full slate of session papers, including two of which we are a part, has been published. Thank you again to my co-author Thomas Newsome, and to Ana Jimenez and Caleb Bryce and all of the session participants for being so fun to work with!
July 14, 2021: We are so happy to announce the publication of an exciting new paper titled, "Predation landscapes influence migratory prey ecology and evolution", just out today in Trends in Ecology and Evolution! Emerging from discussions at the 2019 American Fisheries Society/Wildlife Society Joint Meeting, the review offers a new framework for understanding (and exploring) the relationship between predation, including that imposed by humans, and the behavior, fitness, and conservation of migrating animals. Thank you to all of our co-authors, who were such a delightful team with which to work, and especially to Megan Sabal for her fearless leadership!
January 14, 2021: There are few things more rewarding for a PI, in my view at least, than seeing undergraduate research they help supervise end up as a publication. So, it is with tremendous pride that I congratulate Hyejoo Ro, of the School of Aquatic and Fishery Sciences (SAFS), on her recent first-authored publication in the Journal of Fish and Wildlife Management, profiled nicely today in this story. A product of Hyejoo's involvement in the Alaska Salmon Program and relying on stable isotopic analysis, Hyejoo's paper (co-authored with me (AW), SAFS professor Tom Quinn, and SAFS graduate student Jenny Stern) reveals considerable diversity in the reliance on salmon by brown bears with ready access to salmon spawning streams, underscoring the complexity and flexibility of bear foraging behavior. Here's to a rising star!
January 7, 2021: (AW) had an absolute blast participating in the symposium titled "Biology's Best Friend: Bridging Disciplinary Gaps to Advance Canine Science", which was part of the Society for Integrative and Comparative Biology (SICB) annual meeting. Our talk was titled, "Scavenging effects if large canids". Thank you so much to my co-presenter/author Thomas Newsome and to Ana Jimenez and Caleb Bryce for inviting us to participate!
December 12, 2020: An exiting new review paper has just been published in the January 2021 issue of Ecology Letters, and we got the cover photo to boot (on the right, credit to Brendan Talwar)! The paper, titled "The context dependence of non-consumptive predator effects", is a massive team effort several years in the writing that draws on decades of research in marine and terrestrial systems, on both invertebrates and vertebrates, to provide a broad framework for predicting how prey species are likely to respond behaviorally to the threat of predation, and by extension how predators can shape ecosystems merely through intimidation. Many thanks to co-authors Mike Heithaus, Joel Brown, Burt Kotler, and Os Schmitz for making this paper such a fun one to write! Many thanks also to Miguel Gonzalez, of UW Civil and Environmental Engineering and the College of the Environment, for profiling our paper here!
​November 24, 2020: A new paper by lead author and PEL post-doc Jimmy Kilfoil, scheduled for publication in the ICES Journal of Marine Science, is profiled today on the Tetiaroa Society website. The paper, titled "Using unmanned aerial vehicles and machine learning to improve sea cucumber density estimation in shallow habitats", highlights drone surveys coupled with automated machine learning algorithms as an alternative to traditional approaches (e.g., diver surveys) to enumerating marine invertebrates like sea cucumbers in shallow marine environments. Thank you to the Tetiaroa Society for supporting and showcasing our research, and nice work, Dr. Kilfoil!
November 18, 2020: We are excited for Lauren Satterfield, who today published a book titled, "Caves of the Kyrenia Mountains", which is based on the Fulbright cave research she did in Cyprus from 2014-2015. Way to go, Lauren!
October 29, 2020: Hearty congratulations to Carolyn Shores, who today successfully defended her dissertation! Despite the ongoing pandemic, Carolyn's excellent talk was attended by a large remote audience, and special thanks to our research partners with the Confederated Colville Tribes who were able to tune in! Best of luck on your next adventures, Dr. Shores!!
October 8, 2020: Thank you to John Meyer, of the UW College of the Environment, for featuring us today in a story about communicating science!
August 10, 2020: Just in time for Shark Week, the College of the Environment has released a story profiling a global survey of reef shark populations, which is published in Nature and includes our work in Tetiaroa. The paper's main finding, that sharks appear to be functionally extinct in many of the world's reef ecosystems (about 20%), is sobering, but it also highlights several areas where sharks are doing well, including French Polynesia, and provides guidelines for promoting their recovery where they are depleted. Special thanks to John Meyer for his exceptional coverage of our work, to the Global FinPrint project for inviting us to participate, and to the Seeley Family and the Tetiaora Society for supporting our ongoing reef shark research in Tetiaroa! Update: We are grateful for additional coverage by Molly Hottle (SEFS), UW Today, and the Tetiaroa Society!
April 30, 2020: Thank you to John Meyer of the UW College of the Environment for this great story about a new paper by Alex Lincoln, a former graduate student in Tom Quinn's lab with whom I worked as part of our Alaska Salmon Program bear project!
​March 17, 2020: Huge congratulations to recent UW School of Aquatic and Fishery Sciences (SAFS) graduate Katie Wold for her new publication in the journal Wildlife Biology titled, "Do brown bears Ursus arctos avoid barbed wires deployed to obtain hair samples? A videographer assessment". Working as an undergraduate with me (AW) and Tom Quinn (SAFS), Katie's research showed that wires are generally successful at snagging hair from passing bears (81% of encounters), but that some individuals (particularly females) are disproportionately likely to avoid them, especially if the deployment site offers obvious avoidance routes or the encounter takes place at night. Awesome work, Katie!
March 2, 2020: In January of this year, I (AW) embarked on a new adventure as one of the Editors-in-Chief for the Australian journal Wildlife Research. My new role with this journal is profiled here on the CSIRO Publishing website. Many thanks to Andrea Taylor, Piran White, and Marisa Spiniello for inviting me to join the team!
March 2, 2020: Great new story about Lauren Satterfield's cougar research in High Country News! Way to go, Lauren!
February 20, 2020: As part of his ongoing dissertation research in Central Asia, Shannon Kachel has co-authored a new paper in the Journal of Biogeography identifying the Himalayan wolf (Canis lupus chanco) as a distinct lineage adapted to living at high elevations. Great work, Shannon!
January 29, 2020: Last night, we had the pleasure of participating in the College of the Environment's Tetiaroa Labs Unlocked event, with a display and talk titled "Unlocking the secrets of reef shark nurseries". Special thanks to the Seeley family for their continued support of our reef shark project in French Polynesia, and for providing the impetus for this event! 

p.s. Thank you to the Tetiaroa Society for recapping the event so nicely!
January 27, 2020: Our Tetiaroa reef shark project is profiled in the latest newsletter from the Tetiaroa Society!

​Photo: Jimmy Kilfoil
December 6, 2019: Clint Robins is our newest PhD candidate! Congratulations, Clint, on an excellent talk and successful dissertation proposal defense!
October 22, 2019: New paper out in the Journal of Mammalogy, led by Professor Thomas Newsome of the University of Sydney, on the relationship between anthropogenic food subsidies and dingo diets and intraspecific interactions in central Australia!
September 30-October 3, 2019: Big showing at the 2019 American Fisheries Society & The Wildlife Society Joint Annual Conference in Reno! Lauren Satterfield gave a talk ("Identification of cougar feeding sites from GPS data using hidden Markov models"), Aaron Wirsing gave two as part of invited symposia ("Timescapes of fear: ungulates change spatiotemporal activity in response to contrasting risk from humans and predators"; "Local and landscape drivers of brown bear aggregation to and predation in salmon spawning streams in southwestern Alaska"), and we were both represented on two others. Carolyn Shores deserves special commendation as well, as the lead author on AW's first talk. Whew!
October 1, 2019: Carolyn Shores just had her first dissertation chapter published in Behavioral Ecology (my favorite journal)! Way to go, Carolyn!
September 25, 2019: Congratulations to Laurel Peelle, whose Masters research on using forensic techniques to identify predators at kill sites with limited remains just came out in Wildlife Society Bulletin!
July 20, 2019: The PEL weighs in on the rise of eastern cottontail rabbits in Seattle. Thank you to the Seattle Times for a fun interview!
June 27, 2019: Major development today! Lauren Satterfield was just awarded a prestigious grant from the Future Investigators in NASA Earth and Space Science and Technology (FINESST) program. Her funded study, titled " Fighting fire with four hooves: effects of carnivore-herbivore interactions on fuel characteristics and fire severity", will explore the extent to which effects of wolves and cougars on their ungulate prey might indirectly shape patterns of wildlife activity in eastern Washington, and elsewhere where these species interact. Huge congratulations to Lauren, and thanks also to our collaborator Ernesto Alvarado!
June 7, 2019: Just learned that an upcoming paper from the Shark Bay project, exploring the impacts of a marine heat wave on patterns of abundance and species interactions within a seagrass community, will be featured as the cover article in the August 2019 issue of Ecological Monographs! Congratulations to lead author Dr. Rob Nowicki (Mote Marine Laboratory), who completed the field work as a PhD student working in the the Heithaus Lab at Florida International University and is also responsible for the the cover photo (right).

Update: the article is now published and the cover appears on the right!
May 21, 2019: As we bid a fond farewell to Lily van Eeden, who has spent the last 9 months in our lab as a visiting Fulbright Fellow from the University of Sydney, I also want to recognize her participation in the 5th Annual Duck Family Graduate Workshop on Environmental Politics and Governance. As part of the workshop, Lily gave a talk titled, "Political affiliation predicts public attitudes toward gray wolf (​Canis lupus) conservation". Way to go out on a high note, Lily, thank you for contributing so much to the PEL, and safe travels home!
April 26, 2019: Apryle Craig has been collaborating with 94.7 KUOW to fact-check their wildlife-focused podcast, ​The Wild. Topics have included wolves, bears, beavers, and more. Last night approximately 700 attendees gathered at The Mountaineers Club to celebrate the success of the series. You can access the podcast at: https://www.kuow.org/podcasts/thewild
April 17, 2019: Furthering our outreach mission, Shannon Kachel gave a talk titled, "Predator-prey ecology and conservation in the mountains of Central Asia" as part of the Woodland Park Zoo's Lunchtime Lecture Series. Thanks, Shannon!
April 2, 2019: Today, Apryle Craig presented a talk titled, "Reality TV: Using technology to capture the true nature of nature" in Bellevue for the Mountaineers Club. She discussed a few emerging wildlife research tools including acoustic sampling, drones, and her research that uses animal-borne video collars and accelerometers to understand interactions between recolonizing wolves and deer in Washington.
March 27, 2019: Follow this link for a new Methow Valley News story about Lauren Satterfield and her cougar research, which is part of the Washington Predator-Prey Project. Great story, Lauren!
March 27, 2019: Shout out to Carolyn Shores, featured this morning in a UW Today story titled, "New tool maps a key food source for grizzly bears: huckleberries"! In 2017, Carolyn spent the summer working as part of a USGS project mapping huckleberry access to grizzlies in Montana with funding from the NSF GRFP GRIP (Graduate Research Internship Program). Nice work, Carolyn!
March 21, 2019: Good news is just pouring in! Apryle Craig has been awarded a grant from the 2019 Integral Environmental Big Data Research Fund. Titled, "Behaviorally-mediated trophic cascades: Interactions among wolves, deer, and plants in north central Washington, U.S.A.", the grant will give her the resources to leverage and combine accelerometer and video camera collar data to better understand deer behavioral responses to recolonizing wolves. Well done, Apryle!
March 20, 2019: We are pleased to announce that Clint Robins has a new open access paper out today in Ecosphere based on is Masters research on cougar foraging ecology along western Washington's wildland-urban gradient. Way to go, Clint!
March 19, 2019: Clint Robins is featured today in a Crosscut article titled, "He finds humans 'too unpredictable' - so he studies cougars for a living". Super story, Clint!
March 15, 2019: Congratulations to Shannon Kachel, who today attained the rank of PhD candidate after passing the general exam! Shannon will now enter the final phase of his dissertation research, which addresses interactions between snow leopards, wolves, and shared prey in the high mountains of Central Asia.
February 27, 2019: Just up today, please click here for a new University of Washington story profiling Dr. Justin Dellinger's PhD research on divergent mule and white-tailed deer responses to recolonizing gray wolves in eastern WA. Many thanks to Michelle Ma for the coverage! The photo to the right was snapped by one of the motion-activated game cameras we used to monitor wolf activity over the course of our investigation and is displayed with permission from the Confederated Colville Tribes Fish and Wildlife Department.
February 23, 2019: Today in Omak, WA, Lauren Satterfield continued her presentation binge with a talk titled, "Wolves, Cougars, and Deer in Washington" to the Okanogan Trails Chapter of the Mule Deer Foundation. The talk was part of a Mule Deer Summit. Many thanks to longtime PEL collaborator and friend Matt Marsh, of the Forest Service, for inviting Lauren to participate, and well done Lauren!
February 22, 2019: Today, Clint Robins was invited to return to his alma mater, Williams College, to present a poster titled, "Investigating the effects of urbanization on cougar foraging ecology along the wildland-urban gradient of western Washington" as part of a Class of 1960 Scholars Event held during the annual Williams Biology Alumni Reunion. Thank you, Clint, for representing us with such a great poster!
February 21, 2019: Today, PEL lab member Shannon Kachel took a break from preparing for his upcoming General Exam to give a public talk titled, "Ghost of the mountains: predator-prey ecology and conservation in the high mountains of Central Asia" at the Mountaineers on his research into snow leopard ecology and conservation. Thanks, Shannon!
January 31, 2019: As part of a collaborative seminar series between the Predator Ecology Lab and the Seattle Mountaineers Club, Clint Robins delivered a talk today titled, "Cougars (Puma concolor) in a modern world: the nuances of risk, tolerance, and management."  The evening focused on discussions regarding the recent cougar-caused fatalities in Washington and Oregon, as well as portrayals of wildlife in news media.  The presentation is the first of 3 talks provided by the Predator Ecology Lab at the Mountaineers Club in Seattle. Great job, Clint!
January 31, 2019: Congratulations to Lauren Satterfield, recipient of a prestigious Early Career Grant from the National Geographic Society titled, "Tipping the scales: do humans increase predator hunting success?"! This award will allow Lauren to equip cougars with GPS collars sporting accelerometers capable of identifying predatory behavior (bursts of movement), which when coupled with location data and on-the-ground investigation can be used to identify successful and unsuccessful attacks. Excitingly, it comes on the heels of a Royalty Research Fund grant from the University of Washington (to Lauren and PI Wirsing), which will also support deployment of GPS collars with accelerometers on cougars. The figure to the right is from Wilmers et al. (2017) Ecosphere.
January 24, 2019: Lily van Eeden, who is visiting our lab from Australia, just published a paper on the human dimensions of wildlife showing that the social group(s) you identify with shape(s) your attitudes towards wildlife management, but that the public in general supports nonlethal management and restoring top predators over human-imposed culling of herbivores and mesopredators. Out now in Biological Conservation.
Photo is of a dingo in the Tanami Desert, Northern Territory, Australia